May be stupid to ask, I'm a beginner when it comes to micro controllers, could not find a definitive answer, all infos I found about this don't seem to be absolutely clear to me: can I feed digital inputs with +12V (regulated) as "high" signal on Arduino Mega 2560? I am intending to integrate additional functions by using an Arduino into my existing electronic circuits that run on 12V. I would need to sense +12V for high and GND for low on digital input. I have 32 lines to test.
Information says "operates on (recommended) 7-12 Volts" so at the beginning I guessed yes but then I also found that "input pins operate on 5V".
In putting my mind to it further, the voltage for the signals on the input pins probably needs to be originating from the on board 5V power supply. Is this correct?
I want to be absolutely sure before continuing.
I apologize in case my question is an insult to the experts.
Thanks.